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Related Experiment Videos

Elevation-dependent symptom, mood, and performance changes produced by exposure to hypobaric hypoxia.

B Shukitt-Hale1, L E Banderet, H R Lieberman

  • 1Military Performance and Neuroscience Division, US Army Research Institute of Environmental Medicine, Natick, Massachusetts, USA.

The International Journal of Aviation Psychology
|September 7, 2001
PubMed
Summary

Exposure to high altitudes (above 3,000 m) negatively impacts mood, symptoms, and performance. Effects worsen with increasing altitude and duration, with significant degradation observed even after short exposures to hypobaric hypoxia.

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Area of Science:

  • Environmental Physiology
  • Human Physiology
  • Altitude Medicine

Background:

  • High altitude exposure (above 3,000 m) is known to affect unacclimatized individuals.
  • Changes in symptoms, mood, and cognitive/motor performance are expected with increasing elevation and duration.

Purpose of the Study:

  • To investigate the effects of varying altitude levels and exposure durations on physiological and psychological parameters.
  • To determine the dose-response relationship between hypobaric hypoxia and human performance.

Main Methods:

  • Twenty-three males were exposed to simulated altitudes of 500 m, 4,200 m, and 4,700 m in an altitude chamber.
  • Standardized tests measuring symptoms, mood, and cognitive/motor performance were administered multiple times during 4.5-hour exposures.

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  • Hypobaric hypoxia was the primary environmental stressor.

    • Main Results:

    • Altitude exposure significantly altered symptoms, mood, and performance in an elevation-dependent manner.
    • Adverse effects were more pronounced at higher altitudes (4,700 m vs. 4,200 m) and generally increased with longer exposure durations.
    • All measured parameters were affected at 4,700 m, while only some were affected at 4,200 m.

    Conclusions:

    • Even short exposures to hypobaric hypoxia can degrade specific aspects of human symptoms, mood, and performance.
    • The severity of these adverse effects escalates significantly when testing occurs at 4,700 m compared to 4,200 m.
    • Graded effects on these parameters are evident with increasing altitude and duration of exposure.